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November 4, 2017 04:39
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The Y combinator in Swift. A single argument Y combinator is used to find the factorial of a number.
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| import Foundation | |
| func Y<In, Out>(_ f :@escaping (@escaping(In) -> Out) -> (In) -> Out) -> (In) -> Out { | |
| return { | |
| d in f(Y(f))(d) | |
| } | |
| } | |
| let factorial = | |
| Y {(f) in | |
| { n in | |
| n == 0 ? 1 : n * f(n - 1) | |
| } | |
| } | |
| factorial(4) |
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